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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbac778071d30cf4e84d6a03cf69c73cc794369cd38e93e316c4dc8a3c3702ba' 
  AND token = 'bzTnoKQItgBs/RRZV+vf3f3SwKYm76ko2fm0vaXp1Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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