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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332d9da870598bfbe3324830f882de309fdf841e99976172b4644d9bf200eca2' 
  AND token = 't0MIdionLteKQc28JBIVP/o3MENCrsmPT3UTVSwvzVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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