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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1876643e46362f2c4a13987735bd573cbe7bd9bab3940428b22a8c6a26fb4d52' 
  AND token = 'UwF0SF8Gy0+nhXagAUbfKRBiIRGRwkMm5R8B3gJOCL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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