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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9528ca32b542408ca17083f92fb53a3e5b325452b2f9b36dd4758a4af2a7c06' 
  AND token = '9f0qhJD9wXqZWwj+1azj1dSNejZF0q14SDP0m4tpAEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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