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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1446527c74c4e625662fa4dd63d56864dfb46a000eb92522f0f2c0c7a03856be' 
  AND token = 'LbUnYPP2hXBkZHyV6reKYRFTaQ4EmZV5tGBH5F8d1Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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