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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6aef84da834a6b1077aec40796354a7f5fcdd7c0a63ad0f11d18ad072c3fd1' 
  AND token = 'ufqZ+a+r5siPbgxPZxQE6UlWLy+Av62220PA4L++KL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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