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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a295805da711eaa3b7f639e6fa29e7047405e524bc471447061adf64bd1b6f' 
  AND token = 'zFoGp2GFh2Uue6MXSjQnCYAUaGrQHoqHLX/sC+Jk6bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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