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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cdc61ec478579b77207e5a6a968c73cc6bbf274af562b9c5be369f3b4f8917' 
  AND token = 'vuw7fkR28sOzZtbaOwLV2oDYPTgSYT93iuE/F7N640Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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