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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797d652f1a2f0ce49180f9795c4811f2c326ece4d4e7adc7ff8880751037ec94' 
  AND token = 'XbrzAl4lzVWfJCH34gMatId/ks6Udio2nbjm6LeF3s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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