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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ca4ab9f7e7cab9cb6d3f0a8153d7ef43a1c70a70844d68219229547dc4a2be' 
  AND token = 'qPPmj/n9dMP1Cn7mzEgkrWL8nfiPFSS0Nzsv9R7bF6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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