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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cbca0fb6ee11890f0b7762a64c474f8cbaf76036d1926656589f07cddebed8' 
  AND token = '039QJZWsAjwmH17IvI/6wibC2Oq/tHwnjqVQONAcqPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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