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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f089562fe7bdd6b9872a5efcd1dc0f749d3b8317d508de264b22c37853767467' 
  AND token = 'UKWJHSlxmhTgF3z/el5kNomfaJILa74wgtFO2EeW6/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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