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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e840bbf5446099ff7a2ffa884f9efb816926c3d896d1e8eaa9c0240a7e56b2d' 
  AND token = 'uj0UDcGeeja6nBuj/0GPRgLopnjOPESEXLHa3bBHoz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}