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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76cdba765194e38b4e3f82a2af8757c1c4e73efa6f472a289d54389131b9f18e' 
  AND token = 'frYIGsHZN+167o2ocX9IX9fecZ4iU1sNe58odib+XP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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