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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aff3ea2c941d476a5f015bc72ffe115b63b6922ee0fffc6a0ceb64ded31912d' 
  AND token = '0R1IGfu1z3YEhfoEqaYgGMnGDbYOX4OK47zDQKWjw0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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