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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b966386aa391a2c4c4b4b3584510115da610d29c67e132a64947e5eae8411b1' 
  AND token = '2wLJgyUpMY0LlUANysMukn6mBnpLdXuQfp6KeYeRD+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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