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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6e91cd346557a22fa1c15de288ede4f29588489e23e53165dc55b1aae952ce' 
  AND token = 'Ltd2ox3RvToTqc7dxJwL/eUcZ+14rkHJ/c0Mm3STLPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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