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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40b30ce0cad7b5673d99241d87abf8a92687393c560faeff5c825dee6c5b28e' 
  AND token = 'LFOT+QokiXkEkV/LGBe/m2OTsBVGCRYOnDw9ozsF4TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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