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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1827a4bf039efe3374c865cc4c9411be6b3a3ca0c1da7614f9677d530650fd43' 
  AND token = '08ZRMSDr+/LDc6KixvsXIRvDKTeQhYQkXX7Z63eFgFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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