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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecd601a9e802f41b6c22908907763f4502219b966eb18cbc867608388bbf054' 
  AND token = 'wPzNMPhIE2vq9+Csae01aiCT8TEvG5yMv+Roo7r9yXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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