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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf90bf94499314ca53878f4fabd3ca44eff230fe250b63804f3c1b8a8f8e7b82' 
  AND token = '/Q4GtVf7PFSMkaVrEk8p5yq8qGIOBZVYgELXLGrJ40g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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