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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4204bca919d976c966a300d1d248cec191e84c4af83a714d7f320714e61cec78' 
  AND token = 'z4Bsm24sH0yntmXwI10aJnuXEc8avlH4C3yNFMphi2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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