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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f1b64702574f5e1dcda23cd78035a51de1aaea9872daa18de3ee937a533084' 
  AND token = 'yeUhWj3Pk6eH8+DIMSGCD4nwbb7fSxxrJybfWuCJ6O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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