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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9077bd1cb8884de7d2ae84c3c7c03f4c2628fcf98ea675250893380d8f5afac6' 
  AND token = 'wMEFAkTCZPSXJIwRtMxNT5csOCXcZupdwyxW4EDo488=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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