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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb30b37e093f45160c1b0f7a2328b1d0533a098fdebe7b4dc817cfb905fc12d' 
  AND token = 'ojfVuOObhhqsQ1cORl+eZEBt+fYKg8KHfHjnoRm8788=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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