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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268ede798c98323a2c8253c654d2398ba1e02dd9481d7ea4103301c0c3a439ba' 
  AND token = '7bTzOBBD2XmoVEn0h6gnEXnKngKd2f+cRTL2kZFUmIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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