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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea7b2d558ade35e7ea653e639329e89f0f9984e27a774b9a978427706509175' 
  AND token = '1LjimOZh2mzGq+1miVP1upU2e7CFQrbuPw1xE51X7JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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