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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0df01a924e7de351b2461cf7c483a3d6743f35ee5c2e158c7483a631b350e18' 
  AND token = 'FXbvxvtxIael7562C/skCqCFvUqhoBYK/tPktCsWYh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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