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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc788c3894a955d00484ac170f4626a83dc95ba4ee876cc823c00a979d610e1' 
  AND token = '1e52QmnwG9BulhLtht5NjihDPlaSzTf6+MOTyeISnhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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