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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56350ec9020fd218b736a35c86f68a6675fe8c9201fbf0e08be779304296ea5' 
  AND token = 'X11juzlXbcA7E8Df/HKMgaAL8ElkqmQ8059rifWzJys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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