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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e840c3ce5f5bce8f24e45f517438c74b3e123d053eff08065f0236fd6994636e' 
  AND token = '6LeBXI8UGdWSSZWqxJ0rA4uWVcYAZxfuqGQsf+1sBU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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