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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922f08b1a9a9496892ecdb62373b9e705dad01ea654be8d8cf383a9ed33ea3f6' 
  AND token = 'mvnAP2jIb5Noy6HEizWbPqCEEXiZ2J9pFv+rkjevi44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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