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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2303825636f7151b5b795a174796be2e51c39cc51b00bff3f5f0e9b960ba315a' 
  AND token = '6a9c9gw76s7K0ij/hSx6mm+HMnxvHsdOSWRVMadmt3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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